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000335_fdc@columbia.edu_Wed Oct 22 17:28:29 2003.msg
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From: Frank da Cruz <fdc@columbia.edu>
Newsgroups: comp.protocols.kermit.misc
Subject: Re: DSR off ...
Date: 22 Oct 2003 18:37:01 GMT
Organization: Columbia University
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References: <cf6cc183.0310211334.2b68926b@posting.google.com> <slrnbpbcob.co2.fdc@sesame.cc.columbia.edu> <8ce22d01.0310211755.5aeb83f8@posting.google.com>
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In article <8ce22d01.0310211755.5aeb83f8@posting.google.com>,
Dan Skinner wrote:
: Tried and true null modem cable 25 pin D connectors
: 1 ----- 1
: 2 ----- 3 2 twisted pair cable 1 and 7 separate pairs
: 3 ----- 2
: 7 ----- 7
:
: 4 -| |- 4 4 & 5 jumpered in each head
: 5 -| |- 5
:
: 6 -| |- 6 6 - 8 & 20 jumpered in each head
: 8 -| |- 8
: 20-| |-20
:
: Use xon xoff protocol.
:
That's one kind of null modem cable, called the "fakeout", in which each
computer is reading back its own modem signals. When you actually want to
detect whether the other computer is really there, and also be able to use
hardware flow control, run A's DTR to B's CD and DSR (and v.v.), A's RTS to
B's CTS (and v.v.)
- Frank